Drive for transmitting motion between a drive shaft and a pair of driven shafts, in particular the front and rear drive shafts of a motor vehicle.

摘要

A drive comprising a power dividing unit (1) located between the drive shaft (m) and the driven shafts (a, p) and designed to transmit the torque on the drive shaft to each driven shaft in such a manner that the torques acting on each of the same fall within a given torque ratio and such as to control the driven shafts at speeds depending on the operating conditions of the members connected to the shafts themselves. The two driven shafts are interconnected directly by a hydraulic coupling (3) substantially comprising a first rotary member (10) connected to one of the driven shafts (a), a second rotary member (11) connected to the other driven shaft (p), and a tank (12) for a hydraulic fluid; each of the aforementioned rotary members (10, 11) being provided with fluid conveying means (13) designed to circulate fluid centrifugally between the fluid conveying means of the other rotary member when the speed of one driven shaft differs from that of the other, so as to transmit, via the aforementioned hydraulic coupling, a torque increasing alongside an increase in the difference between the speeds of the driven shafts themselves.